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Neural substrates of phonemic perception.

The temporal lobe in the left hemisphere has long been implicated in the perception of speech sounds. Little is known, however, regarding the specific function of different temporal regions in the analysis of the speech signal. Here we show that an area extending along the left middle and anterior superior temporal sulcus (STS) is more responsive to familiar consonant-vowel syllables during an auditory discrimination task than to comparably complex auditory patterns that cannot be associated with learned phonemic categories. In contrast, areas in the dorsal superior temporal gyrus bilaterally, closer to primary auditory cortex, are activated to the same extent by the phonemic and nonphonemic sounds. Thus, the left middle/anterior STS appears to play a role in phonemic perception. It may represent an intermediate stage of processing in a functional pathway linking areas in the bilateral dorsal superior temporal gyrus, presumably involved in the analysis of physical features of speech and other complex non-speech sounds, to areas in the left anterior STS and middle temporal gyrus that are engaged in higher-level linguistic processes.

Pubmed ID: 15703256

Authors

  • Liebenthal E
  • Binder JR
  • Spitzer SM
  • Possing ET
  • Medler DA

Journal

Cerebral cortex (New York, N.Y. : 1991)

Publication Data

October 9, 2005

Associated Grants

  • Agency: NCRR NIH HHS, Id: M01 RR00058
  • Agency: NIDCD NIH HHS, Id: R01 DC006287
  • Agency: NIDCD NIH HHS, Id: R01 DC006287
  • Agency: NINDS NIH HHS, Id: R01 NS33576

Mesh Terms

  • Acoustic Stimulation
  • Adult
  • Brain Mapping
  • Discrimination (Psychology)
  • Female
  • Functional Laterality
  • Humans
  • Image Processing, Computer-Assisted
  • Magnetic Resonance Imaging
  • Male
  • Middle Aged
  • Oxygen
  • Speech
  • Speech Perception
  • Temporal Lobe